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Technical Overview
2020 Thumpstar MX 50 JR Technical Analysis & Specification Breakdown
Built around Thumpstar's minibike, cross motorcycle platform, the 2020 Thumpstar MX 50 JR features a 49 cc (3 cu in) single cylinder, two-stroke configuration. Internal engine geometry specifies a bore and stroke of 39.5 x 40.0 mm (1.6 x 1.6 inches).
On the scales, the MX 50 JR measures 41.5 kg (91 lbs) dry. Rider ergonomics and chassis geometry center around a 603 mm (23.7 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,032 mm (40.6 in) wheelbase engineered for quick, flickable steering geometry. The 2.3-liter (0.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Standover Height
603 mm (23.7 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Fuel SystemCarburettor. Mikuni 19mm
Transmission
ClutchCentrifugal
Chassis
Frame TypeCentral-Tube Frame with Double-Cradle
Front SuspensionFastace Adjustable Forks
Front Travel205 mm (8.1 inches)
Rear SuspensionFastace Adjustable Shock
Rear Travel185 mm (7.3 inches)
Wheelbase1032 mm (40.6 inches)
Ground Clearance252 mm (9.9 inches)
Wheels & Brakes
Front BrakesSingle disc. Dual piston hydraulic disc
Front Brake Ø190 mm (7.5 inches)
Rear BrakesSingle disc. Single Piston
Rear Brake Ø180 mm (7.1 inches)
WheelsSteel Rim
Dimensions & Weight
Dry Weight41.5 kg (91.5 pounds)
Seat Height603 mm (23.7 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
